Need to root your SM-N900A AT&T Galaxy S4? Use this. Need to unroot your Galaxy Note 3 SM-N9005, SM-N900 Octa-core, T-Mobile, Verizon, Sprint or Canadian variant? Use this.Want to remove any sign of root from your AT&T Galaxy Note 3 so you can make it look like the first day you first bought it or you need to bring it into the AT&T store? Or just want to make it look like stock?
This guide will show you step by step on how to completely unroot and unbrick your SM-N900A AT&T Galaxy Note 3 to bring it back to complete stock. If you initially followed my rooting guide then your Knox security hasn't been flagged and this guide will go along very nicely!
Follow the step by step guide below to unroot your SM-N900A AT&T Galaxy Note 3. This will delete EVERYTHING from your phone! BACK IT UP!
1. Enter into Download Mode by turning off your phone. Then press and hold the volume down, power button, and home button at the same time. You will get to a screen to ask you to press the volume up to continue, press it. 2. Plug in your phone via microUSB and USB side to your computer.3. Download N900AUCUBMI9_OneClickBin using the link below.

Download N900AUCUBMI9_OneClickBin 4. Open "N900AUCUBMI9_OneClickBin" application. It should show a yellow box at the top of the app. If it doesn't, download and install Samsung USB drivers and re-plug in your phone. 5. Click "Start" and your Galaxy Note 3 will be restored to 100% stock. This process will take about 5-10 minutes and you will get a green "Pass" once everything is finished.
6. Once your phone starts to boot up to the "Samsung Galaxy Note 3" logo unplug your phone and take out the battery. Put the battery back in.
7. Now enter into recovery mode. Press and hold the volume up, home button, and power button at the same time until you get to a blue text screen.
8. Using the volume up and down buttons go to "wipe data/factory reset" > "Yes". Select "Yes" using the power button.9. Then choose "reboot system now". 10. You phone will now fully boot up and you will be restored to 100% stock, like the day you first bought the Galaxy Note 3! FAQ: Q: I'm stuck in a bootloop. A: Repeat steps 6-10.Q: I don't see a yellow box in the N900AUCUBMI9_OneClickBin application.A: Download and install Samsung USB drivers, use OEM USB cable, and change USB ports. Q: Will this completely restore my phone to stock and unroot it? A: Yes you will be 100% stock, to the point where you can send this to AT&T or Samsung without them knowing you ever modified your phone. Like Our Facebook Page to Help Support Us! Thank You!Credits - XDA